LoongArch: Use la.pcrel instead of la.abs when it's trivially possible

Let's start to kill la.abs in preparation for the subsequent support of
the PIE kernel.

BTW, Re-tab the indention in arch/loongarch/kernel/entry.S for alignment.

Signed-off-by: Xi Ruoyao <xry111@xry111.site>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>

arch/loongarch/include/asm/stackframe.h

@@ -90,7 +90,7 @@
 	.endm
 
 	.macro	set_saved_sp stackp temp temp2
-	la.abs	  \temp, kernelsp
+	la.pcrel  \temp, kernelsp
 #ifdef CONFIG_SMP
 	LONG_ADD  \temp, \temp, u0
 #endif

arch/loongarch/include/asm/uaccess.h

@@ -22,7 +22,6 @@
 extern u64 __ua_limit;
 
 #define __UA_ADDR	".dword"
-#define __UA_LA		"la.abs"
 #define __UA_LIMIT	__ua_limit
 
 /*

arch/loongarch/kernel/entry.S

@@ -19,70 +19,70 @@
 	.cfi_sections	.debug_frame
 	.align	5
 SYM_FUNC_START(handle_syscall)
-	csrrd	t0, PERCPU_BASE_KS
-	la.abs	t1, kernelsp
-	add.d	t1, t1, t0
-	move	t2, sp
-	ld.d	sp, t1, 0
+	csrrd		t0, PERCPU_BASE_KS
+	la.pcrel	t1, kernelsp
+	add.d		t1, t1, t0
+	move		t2, sp
+	ld.d		sp, t1, 0
 
-	addi.d	sp, sp, -PT_SIZE
-	cfi_st	t2, PT_R3
+	addi.d		sp, sp, -PT_SIZE
+	cfi_st		t2, PT_R3
 	cfi_rel_offset	sp, PT_R3
-	st.d	zero, sp, PT_R0
-	csrrd	t2, LOONGARCH_CSR_PRMD
-	st.d	t2, sp, PT_PRMD
-	csrrd	t2, LOONGARCH_CSR_CRMD
-	st.d	t2, sp, PT_CRMD
-	csrrd	t2, LOONGARCH_CSR_EUEN
-	st.d	t2, sp, PT_EUEN
-	csrrd	t2, LOONGARCH_CSR_ECFG
-	st.d	t2, sp, PT_ECFG
-	csrrd	t2, LOONGARCH_CSR_ESTAT
-	st.d	t2, sp, PT_ESTAT
-	cfi_st	ra, PT_R1
-	cfi_st	a0, PT_R4
-	cfi_st	a1, PT_R5
-	cfi_st	a2, PT_R6
-	cfi_st	a3, PT_R7
-	cfi_st	a4, PT_R8
-	cfi_st	a5, PT_R9
-	cfi_st	a6, PT_R10
-	cfi_st	a7, PT_R11
-	csrrd	ra, LOONGARCH_CSR_ERA
-	st.d	ra, sp, PT_ERA
+	st.d		zero, sp, PT_R0
+	csrrd		t2, LOONGARCH_CSR_PRMD
+	st.d		t2, sp, PT_PRMD
+	csrrd		t2, LOONGARCH_CSR_CRMD
+	st.d		t2, sp, PT_CRMD
+	csrrd		t2, LOONGARCH_CSR_EUEN
+	st.d		t2, sp, PT_EUEN
+	csrrd		t2, LOONGARCH_CSR_ECFG
+	st.d		t2, sp, PT_ECFG
+	csrrd		t2, LOONGARCH_CSR_ESTAT
+	st.d		t2, sp, PT_ESTAT
+	cfi_st		ra, PT_R1
+	cfi_st		a0, PT_R4
+	cfi_st		a1, PT_R5
+	cfi_st		a2, PT_R6
+	cfi_st		a3, PT_R7
+	cfi_st		a4, PT_R8
+	cfi_st		a5, PT_R9
+	cfi_st		a6, PT_R10
+	cfi_st		a7, PT_R11
+	csrrd		ra, LOONGARCH_CSR_ERA
+	st.d		ra, sp, PT_ERA
 	cfi_rel_offset	ra, PT_ERA
 
-	cfi_st	tp, PT_R2
-	cfi_st	u0, PT_R21
-	cfi_st	fp, PT_R22
+	cfi_st		tp, PT_R2
+	cfi_st		u0, PT_R21
+	cfi_st		fp, PT_R22
 
 	SAVE_STATIC
 
-	move	u0, t0
-	li.d	tp, ~_THREAD_MASK
-	and	tp, tp, sp
+	move		u0, t0
+	li.d		tp, ~_THREAD_MASK
+	and		tp, tp, sp
 
-	move	a0, sp
-	bl	do_syscall
+	move		a0, sp
+	bl		do_syscall
 
 	RESTORE_ALL_AND_RET
 SYM_FUNC_END(handle_syscall)
 
 SYM_CODE_START(ret_from_fork)
-	bl	schedule_tail		# a0 = struct task_struct *prev
-	move	a0, sp
-	bl 	syscall_exit_to_user_mode
+	bl		schedule_tail		# a0 = struct task_struct *prev
+	move		a0, sp
+	bl 		syscall_exit_to_user_mode
 	RESTORE_STATIC
 	RESTORE_SOME
 	RESTORE_SP_AND_RET
 SYM_CODE_END(ret_from_fork)
 
 SYM_CODE_START(ret_from_kernel_thread)
-	bl	schedule_tail		# a0 = struct task_struct *prev
-	move	a0, s1
-	jirl	ra, s0, 0
-	move	a0, sp
-	bl	syscall_exit_to_user_mode
+	bl		schedule_tail		# a0 = struct task_struct *prev
+	move		a0, s1
+	jirl		ra, s0, 0
+	move		a0, sp
+	bl		syscall_exit_to_user_mode
 	RESTORE_STATIC
 	RESTORE_SOME
 	RESTORE_SP_AND_RET

arch/loongarch/kernel/head.S

@@ -117,7 +117,7 @@ SYM_CODE_START(smpboot_entry)
 	li.w		t0, 0x00		# FPE=0, SXE=0, ASXE=0, BTE=0
 	csrwr		t0, LOONGARCH_CSR_EUEN
 
-	la.abs		t0, cpuboot_data
+	la.pcrel	t0, cpuboot_data
 	ld.d		sp, t0, CPU_BOOT_STACK
 	ld.d		tp, t0, CPU_BOOT_TINFO
 

arch/loongarch/mm/tlbex.S

@@ -24,8 +24,7 @@
 	move		a0, sp
 	REG_S		a2, sp, PT_BVADDR
 	li.w		a1, \write
-	la.abs		t0, do_page_fault
-	jirl		ra, t0, 0
+	bl		do_page_fault
 	RESTORE_ALL_AND_RET
 	SYM_FUNC_END(tlb_do_page_fault_\write)
 	.endm